|1.||of, using, or characterized by atomic bombs or atomic energy: atomic warfare|
|2.||of, related to, or comprising atoms: atomic hydrogen|
|3.||extremely small; minute|
|4.||logic (of a sentence, formula, etc) having no internal structure at the appropriate level of analysis. In predicate calculus, Fa is an atomic sentence and Fx an atomic predicate|
"When you can drop just one atomic bomb and wipe out Paris or Berlin, war will have become monstrous and impossible." [S. Strunsky, "Yale Review," January 1917]Atomic Age is from 1945.